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Give reasons for the following: (i) Pr...

Give reasons for the following:
(i) Proteins such as insulin used as drugs cannot be taken by mouth but must be injected.
(ii) Fresh tomatoes are a better source of vitamin C than those stored for some time.

Text Solution

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(i) Insulin taken by mouth is ineffective due to its hydrolysis into constituent amino acids.
(ii) On prolonged exposure to air, vitamin C gets destroyed due to aerial oxidation.
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ICSE-BIOMOLECULES-EXERCISE (PART-II)(DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Name a carbohydrate which does not correspond to general formula (Cx(H...

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  2. What is meant by primary and secondary structure of proteins.

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  3. Give reasons for the following: (i) Proteins such as insulin used as...

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  4. Name the vitamin which is vital for the clotting of blood?

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  5. Name two facts in support of zwitterion structure ofa-amino acids.

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  6. Name the vitamins whose deficiency causes (i) Night blindness (ii) Poo...

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  7. What do the following abbreviations stand for : (i) AMP (ii) ADP (i...

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  8. How many molecules of ATP are produced per molecule of glucose in glyc...

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  9. Name thea-amino acid which is optically inactive.

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  10. What are the functions of nucleic acids ? What are the structures of s...

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  11. What is the nature of forces holding two long DNA molecules - together...

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  12. If one strand of DNA has the sequence ATGCTTGA, the sequence in the co...

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  13. Is a diet consisting mainly of rice an adequate diet? Why or why not.

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  14. Differentiate between anomers and epimers.

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  15. Deficiency of which vitamin causes the disease pernicious anaemia ?

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  16. Of the two bases named below, which one is present in RNA and which on...

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  17. Give an example of a disaccharide that contains fructose unit in the f...

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  18. What type of bonding helps in stabilising the a-helix structure of pro...

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  19. What are the products of hydrolysis of sucrose ?

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  20. What are the products of hydrolysis of lactose ?

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